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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 782 $ 581 $ 1,453 $ 1,279
Less: Dividends on mandatory convertible preferred stock 0 (14) 0 (28)
Net income attributable to common stockholders 782 567 1,453 1,251
Add: Dividends related to mandatory convertible preferred stock 0 14 0 28
Net income attributable to common stockholders - diluted $ 782 $ 581 $ 1,453 $ 1,279
Weighted average shares outstanding - basic (in shares) 847,660,488 830,971,528 851,420,686 829,356,255
Effect of dilutive securities:        
Outstanding stock options and unvested stock awards (in shares) 4,380,182 7,247,653 7,308,146 9,260,131
Mandatory convertible preferred stock (in shares) 0 32,238,000 0 32,238,000
Weighted average shares outstanding - diluted (in shares) 852,040,670 870,457,181 858,728,832 870,854,386
Earnings per share - basic (in USD per share) $ 0.92 $ 0.68 $ 1.71 $ 1.51
Earnings per share - diluted (in USD per share) $ 0.92 $ 0.67 $ 1.69 $ 1.47
Outstanding stock options and unvested stock awards (in shares)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities (in shares) 797,948 48,397 487,133 71,734